package com.jm.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.jm.reggie.common.BaseContext;
import com.jm.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();

        String[] urls = {
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",//移动端发送短信
                "/user/login"//移动端登录
        };

        //2、判断本次请求是否需要处理,不需要处理直接放行
        if (this.check(urls, requestURI)) {
            filterChain.doFilter(request, response);
            return;
        }

        //3-1、判断登录状态，如果已登录，则直接放行（后台）
        if (request.getSession().getAttribute("employee") != null) {
            //存储值到threadLocal
            Long empId= (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }

        //3-2、判断登录状态，如果已登录，则直接放行（前台）
        if (request.getSession().getAttribute("user") != null) {
            //存储值到threadLocal
            Long userId= (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }

        //4、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
    }

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    /**
     * 路径匹配，检查本次请求是否需要放行
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            if (PATH_MATCHER.match(url, requestURI)) {
                return true;
            }
        }
        return false;
    }
}
